ok, trying to use a fuel pressure gauge that a friend gave me. It has 1/8"threads coming out of it. I have gone to every hardware store, plumbing store and auto parts store trying to find an adapter from 1/8" to what ever thread the schraeder valve is... Anybody know????
1/16th i believe. I searched everywhere also...came up with nothing local. Ended up ordering from Jegs. Its called a ford fuel rail adapter...go figure.
I did this a few years ago and wasn't able to find an adapter. What I ended up doing is getting a 1/16 female NPT nut to 1/8" tube fitting, installed a short piece of tubing (1-2 inches long) and had a 1/8
tube to 1/8" NPT nut on the other side.
This has worked well for me for about 4 years now.
Good luck. You can unscrew the scrader valve and test your newly purchase fitting before you do all the work.